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This change adds a new option --set-char-signedness to pg_upgrade. It enables user to set arbitrary signedness during pg_upgrade. This helps cases where user who knew they copied the v17 source cluster from x86 (signedness=true) to ARM (signedness=false) can pg_upgrade properly without the prerequisite of acquiring an x86 VM. Reviewed-by: Noah Misch <noah@leadboat.com> Discussion: https://postgr.es/m/CB11ADBC-0C3F-4FE0-A678-666EE80CBB07%40amazon.com